uniapp自定义组件父子组件props传递对象数据时，当对象中包含函数，子组件无法引用到对象中的函数的解决办法【转载】

uniapp自定义组件父子组件props传递对象数据时，当对象中包含函数，子组件无法引用到对象中的函数的解决办法

出现这种情况 是因为uniapp 在传递数据的时候使用的是JSON.parse(JSON.stringify(obj1))这样传递的 无法传递函数。
具体参考
[https://blog.csdn.net/py_boy/article/details/107089150]
解决办法是重写挂载在Vue原型对象上的patch方法 如下

import {myPatch} from "./extendWeixin"  
// #ifndef H5  
Vue.prototype.__patch__ = myPatch;  
// #endif

extendWeixin.js 只需要把原来的patch方法复制过来稍微修改对象复制部分的代码即可

// replace platform patch function  
const ARRAYTYPE = '[object Array]';  
const OBJECTTYPE = '[object Object]';  

export function myPatch (oldVnode, vnode) {  
  var this$1 = this;  
  if (vnode === null) { //destroy  
    return  
  }  
  if (this.mpType === 'page' || this.mpType === 'component') {  
    var mpInstance = this.$scope;  
    var data = Object.create(null);  
    try {  
      data = cloneWithData(this);  
    } catch (err) {  
      console.error(err);  
    }  
    data.__webviewId__ = mpInstance.data.__webviewId__;  
    var mpData = Object.create(null);  
    Object.keys(data).forEach(function (key) { //仅同步 data 中有的数据  
      mpData[key] = mpInstance.data[key];  
    });  
    var diffData = this.$shouldDiffData === false ? data : diff(data, mpData);  
    if (Object.keys(diffData).length) {  
      if (Object({  
        "NODE_ENV": "development",  
        "VUE_APP_NAME": "ancient-empire-app",  
        "VUE_APP_PLATFORM": "mp-weixin",  
        "BASE_URL": "/"  
      }).VUE_APP_DEBUG) {  
        console.log(  
            '[' + (+new Date) + '][' + (mpInstance.is || mpInstance.route)  
            + '][' + this._uid +  
            ']差量更新',  
            JSON.stringify(diffData));  
      }  
      this.__next_tick_pending = true;  
      mpInstance.setData(diffData, function () {  
        this$1.__next_tick_pending = false;  
        flushCallbacks$1(this$1);  
      });  
    } else {  
      flushCallbacks$1(this);  
    }  
  }  
};  

function cloneWithData(vm) {  
  // 确保当前 vm 所有数据被同步  
  var ret = Object.create(null);  
  var dataKeys = [].concat(  
      Object.keys(vm._data || {}),  
      Object.keys(vm._computedWatchers || {}));  

  dataKeys.reduce(function (ret, key) {  
    ret[key] = vm[key];  
    return ret  
  }, ret);  

  // vue-composition-api  
  var compositionApiState = vm.__composition_api_state__  
      || vm.__secret_vfa_state__;  
  var rawBindings = compositionApiState && compositionApiState.rawBindings;  
  if (rawBindings) {  
    Object.keys(rawBindings).forEach(function (key) {  
      ret[key] = vm[key];  
    });  
  }  

  //TODO 需要把无用数据处理掉，比如 list=>l0 则 list 需要移除，否则多传输一份数据  
  Object.assign(ret, vm.$mp.data || {});  
  if (  
      Array.isArray(vm.$options.behaviors) &&  
      vm.$options.behaviors.indexOf('uni://form-field') !== -1  
  ) { //form-field  
    ret['name'] = vm.name;  
    ret['value'] = vm.value;  
  }  

  return copyProperWithMethod(ret);  
}  

function diff(current, pre) {  
  var result = {};  
  syncKeys(current, pre);  
  _diff(current, pre, '', result);  
  return result  
}  

function syncKeys(current, pre) {  
  if (current === pre) {  
    return  
  }  
  var rootCurrentType = type(current);  
  var rootPreType = type(pre);  
  if (rootCurrentType == OBJECTTYPE && rootPreType == OBJECTTYPE) {  
    if (Object.keys(current).length >= Object.keys(pre).length) {  
      for (var key in pre) {  
        var currentValue = current[key];  
        if (currentValue === undefined) {  
          current[key] = null;  
        } else {  
          syncKeys(currentValue, pre[key]);  
        }  
      }  
    }  
  } else if (rootCurrentType == ARRAYTYPE && rootPreType == ARRAYTYPE) {  
    if (current.length >= pre.length) {  
      pre.forEach(function (item, index) {  
        syncKeys(current[index], item);  
      });  
    }  
  }  
}  

function flushCallbacks$1(vm) {  
  if (vm.__next_tick_callbacks && vm.__next_tick_callbacks.length) {  
    if (process.env.VUE_APP_DEBUG) {  
      var mpInstance = vm.$scope;  
      console.log(  
          '[' + (+new Date) + '][' + (mpInstance.is || mpInstance.route) + ']['  
          + vm._uid +  
          ']:flushCallbacks[' + vm.__next_tick_callbacks.length + ']');  
    }  
    var copies = vm.__next_tick_callbacks.slice(0);  
    vm.__next_tick_callbacks.length = 0;  
    for (var i = 0; i < copies.length; i++) {  
      copies[i]();  
    }  
  }  
}  

function _diff(current, pre, path, result) {  
  if (current === pre) {  
    return  
  }  
  var rootCurrentType = type(current);  
  var rootPreType = type(pre);  
  if (rootCurrentType == OBJECTTYPE) {  
    if (rootPreType != OBJECTTYPE || Object.keys(current).length < Object.keys(  
        pre).length) {  
      setResult(result, path, current);  
    } else {  
      var loop = function (key) {  
        var currentValue = current[key];  
        var preValue = pre[key];  
        var currentType = type(currentValue);  
        var preType = type(preValue);  
        if (currentType != ARRAYTYPE && currentType != OBJECTTYPE) {  
          if (currentValue != pre[key]) {  
            setResult(result, (path == '' ? '' : path + ".") + key,  
                currentValue);  
          }  
        } else if (currentType == ARRAYTYPE) {  
          if (preType != ARRAYTYPE) {  
            setResult(result, (path == '' ? '' : path + ".") + key,  
                currentValue);  
          } else {  
            if (currentValue.length < preValue.length) {  
              setResult(result, (path == '' ? '' : path + ".") + key,  
                  currentValue);  
            } else {  
              currentValue.forEach(function (item, index) {  
                _diff(item, preValue[index],  
                    (path == '' ? '' : path + ".") + key + '[' + index + ']',  
                    result);  
              });  
            }  
          }  
        } else if (currentType == OBJECTTYPE) {  
          if (preType != OBJECTTYPE || Object.keys(currentValue).length  
              < Object.keys(preValue).length) {  
            setResult(result, (path == '' ? '' : path + ".") + key,  
                currentValue);  
          } else {  
            for (let subKey in currentValue) {  
              _diff(currentValue[subKey], preValue[subKey],  
                  (path == '' ? '' : path + ".") + key + '.' + subKey, result);  
            }  
          }  
        }  
      };  

      for (var key in current) {  
        loop(key);  
      }  
    }  
  } else if (rootCurrentType == ARRAYTYPE) {  
    if (rootPreType != ARRAYTYPE) {  
      setResult(result, path, current);  
    } else {  
      if (current.length < pre.length) {  
        setResult(result, path, current);  
      } else {  
        current.forEach(function (item, index) {  
          _diff(item, pre[index], path + '[' + index + ']', result);  
        });  
      }  
    }  
  } else {  
    setResult(result, path, current);  
  }  
}  

function setResult(result, k, v) {  
  result[k] = v;  
}  

function type(obj) {  
  return Object.prototype.toString.call(obj)  
}  

function copyProperWithMethod(obj1){  
  let obj2 = JSON.parse(JSON.stringify(obj1));  
  copyMethodWithAddress(obj1, obj2);  
  return obj2;  
}  

function copyMethodWithAddress(from, to) {  
  let properArray = Object.keys(from);  
  for (let proper of properArray) {  
    let p = from[proper];  
    if (p instanceof Function) {  
      to[proper] = p;  
    } else if (p instanceof Array) {  
      if (!to[proper]) {  
        to[proper] = [];  
      }  
      copyMethodWithAddressByArray(p, to[proper]);  
    } else if (p instanceof Object) {  
      if (!to[proper]) {  
        to[proper] = {};  
      }  
      copyMethodWithAddress(p, to[proper])  
    }  
  }  
}  

function copyMethodWithAddressByArray(from, to) {  
  while (to.length < from.length) {  
    to.push(null);  
  }  
  for (let i = 0; i < from.length; i++) {  
    let a = from[i];  
    if (a instanceof Array){  
      copyMethodWithAddressByArray(a, to[i]);  
    } else if (a instanceof Function) {  
      to[i] = a;  
    } else if (a instanceof Object) {  
      copyMethodWithAddress(a, to[i]);  
    }  
  }  
}

重点是 copyMethodWithAddress方法

原文链接：https://blog.csdn.net/qq_40445661/article/details/118539610